1. Someone who abstains from sexual encounters.
2. Someone who rejects a guy or girl for a specific reason such as they're an asshole, they hate them etc. And then everyone calls him/her frigid.
3. What assholes call girls/guys who reject them because they are so stuck up that they think there is nothing wrong with them.

Used mainly In Ireland. Especially in the south East.its means somebody who hasn't shifted somebody, or meet anybody. Shifting and nearing is French kissing basically. You are still a frigid if you kissed someone.

Mariah: HEY YOW! Chung won, were you shiftin' Paddy at the disco
Chantelle : No, Sure Im still a frigid ain't be going no teenmania disco